Steam-superheater for gas-producers.



No. 662,062. Patented Nov. 20, I900.

" E. J. DUFF.

STEAM SUPERHEATEB FOR GAS PRODUCERS.

{Application filed Feb. 18, 1900 No Model.)

m: Nonms #:Yzas co. Puoroumo WASHINGTON, u (L UNTTT-tn STATES PATENT FFICE.

EDIVARD JAMES DUFF, OF LIVERPOOL, ENGLAND, ASSIGNOR OF ONE-HALF TO THE UNITED ALKALI COMPANY, LIMITED, OF SAIWIE PLACE.

STEAM-SUPERHEATER FOR GAS-PRODUCERS.

SPECIFICATION forming part of Letters Patent No. 662,062, dated November 20, 1900.

Application filed February 16, 1900. Serial No. 5,520. (No model.)

To (LZZ whom it may concern.-

Be it known that I, EDWARD JAMES DUFF, a subject of the Queen of Great Britain and Ireland, and a resident of 30 James street, Liverpool, in the county of Lancaster, England, have invented certain new and useful Improvementsin Superheaters to beUsed in- Connection with Gas-Producing Apparatus, (for which British Letters Patent have been applied for, No. 18,582, dated September 14:, 1899,) which invention is fully set forth in the following specification.

This invention relates to apparatus employed in superheating the mixture of air and water vapor for use in the manufacture of gas by gas-producers. The super-heating of the air and water vapor is effected by absorbing a portion of the heat from the producer-gases as they pass to the ammonia-recovery plant and thence to the furnaces. The abstraction of the heat is usually effected by causing the hot producer-gas and the cold mixture of air and water vapor to travel through concentric pipes, an arrangement which, owing to the different contractions and expansions, leads to destruction of the apparatus. According to this invention superheaters forthis purpose are constructed as hereinafter described,with reference to the accompanying drawings.

Figure 1 is a vertical section. Fig. 2 is a section on the line 1 2, Fig. l; and Fig. 3 is a part plan and part section on the line 3 4, Fig. 1.

The pipes A, (preferably four, but other number may be used,) conveying the hot producer-gases, are incased in a preferably-rectangular iron chamber B, (furnished with bathe-plates 1),) through which the air to be superheated is caused to flow, and combined with the said pipes are boxes to catch the dust which accompanies producer gases. The said pipes are connected alternately at top and bottom by connecting-boxes O, which are built outside the said chamber-B, so that with the pipes A they form, practically, one long zigzag pipe. The gases from the producer enter the first pipe at a near the bottom and at one end of the superheating-chamber, and after passing upward and downward several times, according to the number of pipes used, the said gases leave at a at the other end of the chamber. The air and steam enter the superheating-chamber at 19 near the top and at the side at which the producergases are leaving, and are caused by the baffle-plates b, projecting alternately from the top and bottom of the rectangular chamber,

to travel outside the pipes A and in a direction opposite to that taken by the gases through the said pipes and leave through an exit-pipe 12 near the bottom at the far end of the superheating-cham berthat is, the end nearest to the gas-producing chamber. The dust-boxes are in the case of the entering and exit pipes A prolongations of these pipes below the bottom of the superheating-chamber,

as shown at a and they are furnished at their lower ends with doors through which the dust can be removed. In the case of the intermediate pipes A the dust-box is constituted by the connecting-box O, which is in the form of a hopper, also provided with a door below. This hopper is sufficiently large to cause a diminution in the gas-current at this point, and thus aid the settlement of the dust.

Having now particularly described and ascertained the nature of this invention and in what manner the same is to be performed, I declare that what I claim is- A superheater for use in connection with gas-producing apparatus consisting of a vertical chamber provided with an inlet and an outlet for air and steam, and with compartments, above and outside the vertical chamber, andprovided with manholes; dust-boxes below and outside the vertical chamber and each having an outlet provided with a cover; pipes passing vertically through the said vertical chamber and communicating in pairs at their upperends with the said compartments, 0 and communicating at their lower ends through openings in the bot-tom of the vertical casing, with the dust-boxes, the said dustboxes of the first pipe and the last pipe having outlet and inlet passages for the gases 5 communicating therewith respectively and one dust-box having a capacity to diminish the force of the gas-current, the aforesaid inlet and outlet for air and steam communicating with the vertical chamber respectively at top near the first pipe and at bottom near the last pipe; and baffleplates extending between the pipes from side to side of the vertical chamber, and alternately from the top to near the bottom, and from the bottom to near the top; all substantially as hei'einbe' fore described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

EDWARD JAMES DUFF.

Witnesses:

ALFRED PATOHE'IT, THOMAS SPROAT. 

